package com.plealog.genericapp.protection.distrib;


import java.util.Arrays;

/**
 * A Base64 encoder/decoder.
 * <p>
 * This class is used to encode and decode data in Base64 format as described in RFC 1521.
 * http://www.rfc-editor.org/rfc/rfc1521.txt
 * <p>
 * Adapted from http://www.source-code.biz/base64coder/java/ :
 * <p>
 * Copyright 2003-2010 Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland
 * www.source-code.biz, www.inventec.ch/chdh
 * <p>
 * This module is multi-licensed and may be used under the terms
 * of any of the following licenses:
 * <p>
 * EPL, Eclipse Public License, V1.0 or later, http://www.eclipse.org/legal
 * LGPL, GNU Lesser General Public License, V2.1 or later, http://www.gnu.org/licenses/lgpl.html
 * GPL, GNU General Public License, V2 or later, http://www.gnu.org/licenses/gpl.html
 * AGPL, GNU Affero General Public License V3 or later, http://www.gnu.org/licenses/agpl.html
 * AL, Apache License, V2.0 or later, http://www.apache.org/licenses
 * BSD, BSD License, http://www.opensource.org/licenses/bsd-license.php
 * MIT, MIT License, http://www.opensource.org/licenses/MIT
 * <p>
 * Please contact the author if you need another license.
 * This module is provided "as is", without warranties of any kind.
 */

public class HStringCoder {

	// Mapping table from 6-bit nibbles to Base64 characters.
	private static final char[] map1 = new char[64];

	static {
		int i = 0;
		for (char c = 'A'; c <= 'Z'; c++) map1[i++] = c;
		for (char c = 'a'; c <= 'z'; c++) map1[i++] = c;
		for (char c = '0'; c <= '9'; c++) map1[i++] = c;
		map1[i++] = '+';
		map1[i++] = '/';
	}

	// Mapping table from Base64 characters to 6-bit nibbles.
	private static final byte[] map2 = new byte[128];

	static {
		Arrays.fill(map2, (byte) -1);
		for (int i = 0; i < 64; i++) map2[map1[i]] = (byte) i;
	}

	// The line separator string of the operating system.
	@SuppressWarnings("unused")
	private static final String systemLineSeparator = System.getProperty(
			new HStringCoder("GbulSZz5XZhBmc0F3b$I").toString() /* => line.separator */);


	/**
	 * Encodes a string into Base64 format.
	 * No blanks or line breaks are inserted.
	 *
	 * @param s A String to be encoded.
	 * @return A String containing the Base64 encoded data.
	 */
	private static String encodeString(String s) {
		return new String(encode(s.getBytes()));
	}

	/**
	 * Encodes a byte array into Base 64 format and breaks the output into lines of 76 characters.
	 * This method is compatible with <code>sun.misc.BASE64Encoder.encodeBuffer(byte[])</code>.
	 * @param in  An array containing the data bytes to be encoded.
	 * @return A String containing the Base64 encoded data, broken into lines.
	 */
	/*private static final String encodeLines (byte[] in) {
		return encodeLines(in, 0, in.length, 76, systemLineSeparator); }*/

	/**
	 * Encodes a byte array into Base 64 format and breaks the output into lines.
	 * @param in            An array containing the data bytes to be encoded.
	 * @param iOff          Offset of the first byte in <code>in</code> to be processed.
	 * @param iLen          Number of bytes to be processed in <code>in</code>, starting at <code>iOff</code>.
	 * @param lineLen       Line length for the output data. Should be a multiple of 4.
	 * @param lineSeparator The line separator to be used to separate the output lines.
	 * @return A String containing the Base64 encoded data, broken into lines.
	 */
	/*private static final String encodeLines (byte[] in, int iOff, int iLen, int lineLen, String lineSeparator) {
		int blockLen = (lineLen*3) / 4;
		if (blockLen <= 0) throw new IllegalArgumentException();
		int lines = (iLen+blockLen-1) / blockLen;
		int bufLen = ((iLen+2)/3)*4 + lines*lineSeparator.length();
		StringBuilder buf = new StringBuilder(bufLen);
		int ip = 0;
		while (ip < iLen) {
			int l = Math.min(iLen-ip, blockLen);
			buf.append (encode(in, iOff+ip, l));
			buf.append (lineSeparator);
			ip += l; }
		return buf.toString(); }*/

	/**
	 * Encodes a byte array into Base64 format.
	 * No blanks or line breaks are inserted in the output.
	 *
	 * @param in An array containing the data bytes to be encoded.
	 * @return A character array containing the Base64 encoded data.
	 */
	private static char[] encode(byte[] in) {
		return encode(in, 0, in.length);
	}

	/**
	 * Encodes a byte array into Base64 format.
	 * No blanks or line breaks are inserted in the output.
	 * @param in    An array containing the data bytes to be encoded.
	 * @param iLen  Number of bytes to process in <code>in</code>.
	 * @return A character array containing the Base64 encoded data.
	 */
	/*private static final char[] encode (byte[] in, int iLen) {
		return encode(in, 0, iLen); }*/

	/**
	 * Encodes a byte array into Base64 format.
	 * No blanks or line breaks are inserted in the output.
	 *
	 * @param in   An array containing the data bytes to be encoded.
	 * @param iOff Offset of the first byte in <code>in</code> to be processed.
	 * @param iLen Number of bytes to process in <code>in</code>, starting at <code>iOff</code>.
	 * @return A character array containing the Base64 encoded data.
	 */
	private static char[] encode(byte[] in, int iOff, int iLen) {
		int oDataLen = (iLen * 4 + 2) / 3;       // output length without padding
		int oLen = ((iLen + 2) / 3) * 4;         // output length including padding
		char[] out = new char[oLen];
		int ip = iOff;
		int iEnd = iOff + iLen;
		int op = 0;
		while (ip < iEnd) {
			int i0 = in[ip++] & 0xff;
			int i1 = ip < iEnd ? in[ip++] & 0xff : 0;
			int i2 = ip < iEnd ? in[ip++] & 0xff : 0;
			int o0 = i0 >>> 2;
			int o1 = ((i0 & 3) << 4) | (i1 >>> 4);
			int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);
			int o3 = i2 & 0x3F;
			out[op++] = map1[o0];
			out[op++] = map1[o1];
			out[op] = op < oDataLen ? map1[o2] : '$';
			op++;
			out[op] = op < oDataLen ? map1[o3] : '$';
			op++;
		}
		return out;
	}

	/**
	 * Decodes a string from Base64 format.
	 * No blanks or line breaks are allowed within the Base64 encoded input data.
	 *
	 * @param s A Base64 String to be decoded.
	 * @return A String containing the decoded data.
	 * @throws IllegalArgumentException If the input is not valid Base64 encoded data.
	 */
	private static String decodeString(String s) {
		return new String(decode(s));
	}

	/**
	 * Decodes a byte array from Base64 format and ignores line separators, tabs and blanks.
	 * CR, LF, Tab and Space characters are ignored in the input data.
	 * This method is compatible with <code>sun.misc.BASE64Decoder.decodeBuffer(String)</code>.
	 * @param s  A Base64 String to be decoded.
	 * @return An array containing the decoded data bytes.
	 * @throws IllegalArgumentException If the input is not valid Base64 encoded data.
	 */
	/*private static final byte[] decodeLines (String s) {
		char[] buf = new char[s.length()];
		int p = 0;
		for (int ip = 0; ip < s.length(); ip++) {
			char c = s.charAt(ip);
			if (c != ' ' && c != '\r' && c != '\n' && c != '\t')
				buf[p++] = c; }
		return decode(buf, 0, p); }*/

	/**
	 * Decodes a byte array from Base64 format.
	 * No blanks or line breaks are allowed within the Base64 encoded input data.
	 *
	 * @param s A Base64 String to be decoded.
	 * @return An array containing the decoded data bytes.
	 * @throws IllegalArgumentException If the input is not valid Base64 encoded data.
	 */
	private static byte[] decode(String s) {
		return decode(s.toCharArray());
	}

	/**
	 * Decodes a byte array from Base64 format.
	 * No blanks or line breaks are allowed within the Base64 encoded input data.
	 *
	 * @param in A character array containing the Base64 encoded data.
	 * @return An array containing the decoded data bytes.
	 * @throws IllegalArgumentException If the input is not valid Base64 encoded data.
	 */
	private static byte[] decode(char[] in) {
		return decode(in, 0, in.length);
	}

	/**
	 * Decodes a byte array from Base64 format.
	 * No blanks or line breaks are allowed within the Base64 encoded input data.
	 *
	 * @param in   A character array containing the Base64 encoded data.
	 * @param iOff Offset of the first character in <code>in</code> to be processed.
	 * @param iLen Number of characters to process in <code>in</code>, starting at <code>iOff</code>.
	 * @return An array containing the decoded data bytes.
	 * @throws IllegalArgumentException If the input is not valid Base64 encoded data.
	 */
	private static byte[] decode(char[] in, int iOff, int iLen) {
		if (iLen % 4 != 0) {
			throw new IllegalArgumentException(new HStringCoder(
					"GTuV3ZoRGIm9GIuV2Yk9WZgQWaw5XdgQ3cyRWan5GIzlGIv5CdhBGI11HbpRGclxGIm9DIuQ").toString()
					/* => Length of encoded input string is not a multiple of 4. */);
		}
		while (iLen > 0 && in[iOff + iLen - 1] == '$') iLen--;
		int oLen = (iLen * 3) / 4;
		byte[] out = new byte[oLen];
		int ip = iOff;
		int iEnd = iOff + iLen;
		int op = 0;
		while (ip < iEnd) {
			int i0 = in[ip++];
			int i1 = in[ip++];
			int i2 = ip < iEnd ? in[ip++] : 'A';
			int i3 = ip < iEnd ? in[ip++] : 'A';
			if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127)
				throw new IllegalArgumentException(new HStringCoder(
						"WSsxWZhdCbjBGayFWY0NXZgIWag4WZj52blRCZkBXYhRgL$$").toString()
						/* => Illegal character in encoded data. */);
			int b0 = map2[i0];
			int b1 = map2[i1];
			int b2 = map2[i2];
			int b3 = map2[i3];
			if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0)
				throw new IllegalArgumentException(new HStringCoder(
						"WSsxWZhdCbjBGayFWY0NXZgIWag4WZj52blRCZkBXYhRgL$$").toString()
						/* => Illegal character in encoded data. */);
			int o0 = (b0 << 2) | (b1 >>> 4);
			int o1 = ((b1 & 0xf) << 4) | (b2 >>> 2);
			int o2 = ((b2 & 3) << 6) | b3;
			out[op++] = (byte) o0;
			if (op < oLen) out[op++] = (byte) o1;
			if (op < oLen) out[op++] = (byte) o2;
		}
		return out;
	}

	// Dummy constructor.
	@SuppressWarnings("unused")
	private HStringCoder() {
	}

	/* ADDED Patrick*/

	private static String s;

	private static String flip(String s) {
		StringBuilder buf = new StringBuilder();
		int i, size = s.length();

		/*if ((size%2)!=0){//this is not required, but check carefully
		s += "#";
		size++;
	}*/
		i = 0;
		while (i < size) {
			buf.append(s.charAt(i + 1));
			buf.append(s.charAt(i));
			i += 2;
		}
		return buf.toString();
	}

	public static final String obfuscate(String str) {
		StringBuilder buf = new StringBuilder(new HStringCoder("mb3VEIThHdpJmbDd2blRicig").toString());
		String encoded = encodeString(str);
		encoded = flip(encoded);
		buf.append(encoded);
		buf.append(new HStringCoder("iIukGdT9HdpJmbocSKvAiK9AiP$A"));
		buf.append(str);
		buf.append(new HStringCoder("CIvo"));
		return buf.toString();
	}

	public static final String obfuscateNoComment(String str) {
		StringBuilder buf = new StringBuilder(new HStringCoder("mb3VEIThHdpJmbDd2blRicig").toString());
		String encoded = encodeString(str);
		encoded = flip(encoded);
		buf.append(encoded);
		buf.append(new HStringCoder("iIukGdT9HdpJmbocQK$$"));
		return buf.toString();
	}

	public HStringCoder(String str) {
		String encoded = flip(str);
		s = decodeString(encoded);
	}

	public String toString() {
		return s;
	}
} // end class HStringCoder
